kenneth curtis of tupelo, mississippi, has been taken into custody and charged with sending the letters. the f.b.i. believes curtis has sent over letters with similar content to other members of congress in the past and that pattern helped lead to this arrest. the presence of small amounts of ricin in these letters has now been confirmed. wyatt andrews, cbs news, washington. >> pelley: britain said goodbye today to the iron lady, margaret thatcher. her funeral at st. paul's cathedral was attended by queen elizabeth and dignitaries from 170 countries, including three former u.s. secretaries of state. thatcher was great britain's first female prime minister. she died of a stroke last week at 87. there has been an arrest now in the murders of two texas prosecutors. we'll have that next. if you have high cholesterol, here's some information that may be worth looking into. in a clinical trial versus lipitor, crestor got more high-risk patients' bad cholesterol to a goal of under 100. getting to goal is important, especially if you have high cholesterol plus any of these risk factors because